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Old 04-26-2021, 02:58 PM   #1
Junior Member
JeffThor325's Avatar
Brand: Thor Motor Coach
State: New York
Posts: 7
THOR #21937
Dual charge controllers

Okay, here is my setup:
  1. I have two 195W solar panels mounted on my roof
  2. I just bought four 250W solar panels
  3. One 400W wind turbine
  4. Working on building a 540W wind turbine
  5. Four 100Ah AGM batteries
  6. 2000W inverter

I know enough to know that having dissimilar solar panels can cause weirdness with power output. I still have to check the labels on the two smaller panels, but could potentially put all the panels into a single solar array without taking too much of a hit in terms of power output.

I also happen to have a second charge controller, still in the packaging.

So I wondered about simply having two separate solar arrays, each going through its own charge controller but going to the same battery bank.

My thinking is, since the charge controllers allow for only unidirectional energy flow, it would be a little like two horses pulling the same cart only neither horse knows of the other's existence.

This might be a really terrible idea -- which is the precise reason why I'm posting here. If it is, I'd like to understand why. All thoughts and input welcomed.

1995 Thor Columbus 325
Digital nomad
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Old 04-26-2021, 03:06 PM   #2
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Judge's Avatar
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 2,100
THOR #12751
Yes, you can connect two different solar arrays and charge controllers to the same battery bank. Really no different than having the converter in an RV and then adding a solar charge controller. The Array 1 and Array 2 voltages could be different and you can connect more than two arrays and charge controllers- all in parallel.

The battery bank voltage must be lower than your array Voltage so that your system would charge your battery.

You probably would not want to wire the panels in series and use one controller since the lower 195W panels would drag down the 250W panels.

Here is a diagram....
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Old 04-26-2021, 05:39 PM   #3
Senior Member
Brand: Thor Motor Coach
State: Missouri
Posts: 1,444
THOR #6903
Done this ever since solar panels were available with enough capacity to run our remote livestock water wells

One array facing South and one West typically due to existing structure
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Old 04-26-2021, 05:49 PM   #4
Senior Member
The_Breeze's Avatar
Brand: Thor Motor Coach
Model: Chateau 31L
State: Florida
Posts: 1,890
THOR #12189
Originally Posted by Judge View Post

Here is a diagram....
Thank you for this. I can see a lot of advantage to this set up vs. using a combiner box and a single run to the batteries. It more readily address your advice on the series/parallel combination in times of partial or full shade.

I'm making reference to the attached which you've seen before.

p.s. I shamelessly lifted it.
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inverter, solar

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